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# Transformation

`public interface Transformation`
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android.service.autofill.Transformation

Known indirect subclasses CharSequenceTransformation, DateTransformation, ImageTransformation
CharSequenceTransformation | Replaces a `TextView` child of a `CustomDescription` with the contents of one or more regular expressions (regexs).
DateTransformation | Replaces a `TextView` child of a `CustomDescription` with the contents of a field that is expected to have a `AutofillValue#forDate(long)`.
ImageTransformation | Replaces the content of a child `ImageView` of a `RemoteViews` with the first image that matches a regular expression (regex).

Helper class used to change a child view of a `presentation template` at runtime, using the values of fields contained in the screen.

Typically used by `CustomDescription` to provide a customized autofill save UI.

Note: This interface is not meant to be implemented by app developers; only implementations provided by the Android System can be used in other Autofill APIs.

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